Pneumatic jack



EASZM Wim-ch l QZQQ Filed March 15.

\ specification,

Patented Mar. lll, M246 NETE@ TTS matan earner pararon.

PNEUMATIC JACK.

application mea march 13, 1922. serial no. 543,230.

To all whom z't may concern Be it known that l, WILLIAM A. GIBSON, a citizen of the United VVStates of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful lmprovements in ljneumatic Jacks, of which the following is a reference being had therein to the accompanying drawings.

This invention relates to devices known as lifting jacks, and more particularly to devices especially adapted for use in connecvice illustrative of the invention,

`the side wall of the tion with motor vehicles. lt is an object of the invention to provide a device or" very simple construction wherein the device is operated by compressed air.

A. further object is to provide an air container into which air may be forced under pressure to operate the device in raising a load and which container is of simple construction and eiiicient in operation, all liability to leakage being obviated.

A further object is to provide certain other new and useful features in the construction and arrangement or parts, all as hereinaftter more fully described.

lvl] ith the above and other ends in view, the invention consists in providing an expansible metal casing, and inclosing within this casing an inflatable air container adapted to expand under pressureto expand the casing andoperate the device in raising a load.

rlhe invention also consists in certain new and useful ieatures in the construction and arrangement or parts .and in 'the matters hereinafter set forth and more particularly pointed out in the appended claims, reference being had to the accompanying drawin in whichig. l is a vertical section through a debase or :loot portion thereof shown partly in elevation, and

Fig. 2 a plan view of a stand or base of the device detached.

'lhe device as shown in the accdmpanying drawing comprises a metal'stand l'having a lianged base 2 adapted to form a irm support for the device so that it will stand upright. `Rising from the base lis a hollow pedestal 3 having a head Llat its upper end which head is cup-shaped or provided with a hemispherical cavity 5 in itsuupper endl head being cylindrical and meeting the surface of the cavity in a sobstantially sharp annular rim or ridge 6..v

in place thereon .with the 'ed thereon as the Sleeved'over the head l is a tubular member or sleeve 7 with the upper end of the sleeve closed air tight and `of semi-spherical form so that the inner tace of the end wall-,8 or the sleevewill form substantially a continuation of the face 5 of the cup.` i rl`his sleeve is of a diameter to lit closely over the head d and slide freely thereon, and secured in any suitable manner to the upperend of the sleeve is a stem 9 which may be formed tubular, as shown, with the wall or' the tube flanged outwardly at its lower end and riveted or otherwise secured to the end wall Q of the sleeve. Carried by the upper end or the stem 9 is a suitable cast metal head l@ formed with a tubular portion ll tov fit over the upper end of the stem 9 and is secured by forming an annular groove 12 in the stem and in turning the lower edge of the sleeve portion l1 into this groove.

Seated within the seat or cup 5 of the head d is an expansible and inflatable air bulb i3 formed preferably o' rubber and provided n with a stem lll extending downward through an openin l5 in the bottom portion o' the cup. This stem is adapted to contain the usual valve mechanism (not shown.) 'for permitting a free dow ol air into the bulb and checlrlng the discharge therefrom. The 'lower end of the stem il-- may be provided with a suitable connection i6 which an air hose may be attached to the stem and air under pressure 'forced therethrough into the bulb i3.

rThe semi-spherical upper end 8 o the sleeve 'l' forms a smooth interior seat rior bulb 13 and the cup 5 forms a like seat rhor stand l, and as the rim -6 ol 'the cup is com paratively sharp, no shoulder is termed' where it'meets the inner surface o the sleeve 7 which would be liable to iniure the bulb when the same is inflated under heavy pres-- sure and the sleeve is forced upwardly thereby, sliding upon the head @C and being guidbulb is expanded by air forced into -it through the stern le.

A supply of air under pressure is provided at most lling stations for the useo motorists in inflating tires and the llieavier and more expensive motor vehicles are commonly provided with an air pump. By carrying a jack oi. the construction herein described, the motorist may very quickly and conveniently up his car by simply placing by means ezt ico the present device in position beneath the axle, attaching an air hose to the connection 16,'and turning on the air, when-he is at a station Where a supply of air, under pres# t sure, is provided, or when his car is equipped with an air pump. lf an air supply or power driven pump are not'available, then he may attach the ordinary air pump tol the connection and in that way readily raise lo the axle to the desired height.

A device of very simple construction is provided and one which may be manufactured at a minimum cost and as thergvare only three movable parts and" no` notched le members, dogs, ratchets, or gears are necessar the 4liability of the device to get out of or er is minimized, and its operation greatly facilitated. y

Obviously, the particular construction and a@ configuration of parts may be varied within the scope of the appended claims, and l do not'therefore limit myself to the particular form or arrangement shown.

Havin thus fully described my invention, a5r what lf c aim is l. A lifting device of the character described comprising a -base member, a lifting member movable upon said basev member, saidmcmbers together forming a casing, and ae an inatable member within said casing.,y

2. 'A lifting device of the character described jcomprising a base member formed with a concavity, a lifting member slidable .upon said base member and 4co-oI'ier-ating aa therewith'to form a closer chamber, and an /inatable member within said chamber seated within saidconcavity.

3. A lifting device of the character described comprising a base member formed de with a concavity in its upper end, a lifting member sleeved upon the -base member and slidable thereon, said lifting member having f .a closed vend opposing said concavity and said base member and lifting member 'toa gether forming a closed chamber, an inflatable member in said chamber, and means on said inflatable member for admitting iiuidunder lpressure thereto, said baseL member being ormed with. an opening .to 'receive an said means. b

d. A lifting Jack comprising abase mem- 'formed with -an opening ine'aaai opening' extending through said head into said concavity to receive said stem.

A. lifting Jack comprising a base member having a base flange to support the member in upright position and a cylindrical head formed with a semi-spherical concavity inits upper en the outer surface of said head meeting said surface of said concavity in a substantially sharp edge, a sleeve slidspherical closed end opposing said concavity of cylinelo -able upon said head and formed with a semiin the head, said head and sleeve formingl a v closed chamber, a rubber bulb in said chamber, and a stem on said bulb, said head being extending there; through to receive said stem.

6. A lifting device of the character described comprising a casing expansible in one direction only, an expansible fluid con# tainer within said casing and confined thereby to expansion -in one direction only, and

Y'a lifting member operated by the expansion of said fluid container within said caslng.

`7.` In a lifting device of the character described, the combination of an expansible fluid container, means for admitting fluid under pressure thereto, hollow member slidable upon said base, said base and hollow member together forming eov a `base member, a

a tight expansible casing to completely enclose the 'expansible fluid container, and a lifting member member.`

' ln testimony whereof l ax in presenceA of two witnesses.

WILLIAM A. Giesen'.

my signature Witnesses:

LEwis E. FLANDERS,

ANNA M; Donn l upon said slidable hollow 

